Lexar LNM790X002T-RNNNU
Lexar NM790 SSD User Manual
Model: LNM790X002T-RNNNU
Brand: Lexar
Introduction
This manual provides essential information for the installation, operation, and maintenance of your Lexar NM790 M.2 2280 PCIe Gen 4x4 NVMe SSD. Designed for high-performance computing, this SSD offers exceptional speed and efficiency for various applications, including gaming and content creation. It is compatible with desktop computers, laptops, and PlayStation 5 consoles.
What's in the Box
- Lexar NM790 SSD
Setup
General Installation Guidelines (Desktop/Laptop)
Before beginning installation, ensure your system is powered off and unplugged. Refer to your computer's motherboard or laptop's service manual for specific M.2 slot locations and installation procedures. Always handle the SSD by its edges to avoid static discharge.
- Locate an available M.2 slot on your motherboard.
- Gently insert the Lexar NM790 SSD into the M.2 slot at a slight angle.
- Press down the SSD and secure it with the provided screw (usually included with your motherboard/laptop).
- Close your computer case and reconnect power.

Image: The Lexar NM790 M.2 2280 PCIe Gen4 NVMe SSD, a compact solid-state drive designed for high-speed data transfer.
PlayStation 5 Compatibility
The Lexar NM790 SSD is compatible with PlayStation 5 consoles for storage expansion. Ensure your PS5 system software is up to date before installation. For detailed PS5 installation instructions, please refer to the official PlayStation support documentation.

Image: The Lexar NM790 SSD shown with a PlayStation 5 controller, indicating its compatibility with the PS5 console.
Operating the SSD
Initialization and Formatting
After physical installation, the SSD needs to be initialized and formatted before use. This process varies slightly depending on your operating system (Windows, macOS, Linux) or console (PS5). Generally, you will access Disk Management (Windows), Disk Utility (macOS), or the PS5 storage settings to prepare the drive.
Performance Characteristics
The Lexar NM790 SSD leverages PCIe Gen4x4 NVMe technology, Host Memory Buffer (HMB) 3.0, and Dynamic SLC Cache to deliver high-speed performance. Expect sequential read speeds up to 7400MB/s and sequential write speeds up to 6500MB/s. Actual performance may vary based on system configuration and workload.

Image: A graph illustrating the Lexar NM790 SSD's performance, showing it is significantly faster than PCIe Gen3 SSDs.

Image: An illustration highlighting the Host Memory Buffer 3.0 feature of the Lexar NM790 SSD, which enhances data transfer speeds.
Maintenance
Solid State Drives generally require less maintenance than traditional hard drives. However, to ensure optimal performance and longevity:
- Firmware Updates: Periodically check the Lexar official website for any available firmware updates for your NM790 SSD. Firmware updates can improve performance, stability, and compatibility.
- TRIM Command: Ensure your operating system has TRIM enabled. TRIM helps the SSD manage its data more efficiently, preventing performance degradation over time. Most modern operating systems enable TRIM by default for SSDs.
- Avoid Full Capacity: While SSDs perform well even when nearly full, leaving some free space (e.g., 10-15%) can help maintain optimal performance and extend the drive's lifespan.
Troubleshooting
If you encounter issues with your Lexar NM790 SSD, consider the following common troubleshooting steps:
- SSD Not Detected:
- Verify the SSD is correctly seated in the M.2 slot.
- Check your system's BIOS/UEFI settings to ensure the M.2 slot is enabled and configured correctly (e.g., NVMe mode).
- Ensure your motherboard drivers are up to date.
- For PS5, ensure the SSD is fully inserted and the cover is properly secured.
- Slow Performance:
- Confirm your system supports PCIe Gen4. If connected to a Gen3 slot, performance will be limited to Gen3 speeds.
- Check if TRIM is enabled (as mentioned in Maintenance section).
- Ensure your system's drivers (chipset, NVMe) are up to date.
- Monitor SSD temperature. Excessive heat can cause thermal throttling, reducing performance.
- Data Corruption/Errors:
- Run a disk check utility (e.g., chkdsk on Windows).
- Ensure proper shutdown procedures are followed to prevent data loss.
- Consider updating SSD firmware.
If issues persist, contact Lexar customer support for further assistance.
Specifications
| Feature | Detail |
|---|---|
| Brand | Lexar |
| Series | NM790 |
| Model Number | LNM790X002T-RNNNU |
| Digital Storage Capacity | 2TB (2000 GB) |
| Hard Disk Interface | NVMe |
| Connectivity Technology | M.2 |
| Compatible Devices | Desktop, Laptop, PS5 |
| Installation Type | Internal Hard Drive |
| Color | Black |
| Item Weight | 0.208 ounces |
| Sequential Read Speed | Up to 7400 MB/s |
| Sequential Write Speed | Up to 6500 MB/s |
| Terabytes Written (TBW) | 1500 TBW |
| Special Feature | Single-sided design |
Warranty and Support
The Lexar NM790 SSD comes with a Five-year limited warranty. For warranty claims, technical support, or additional product information, please visit the official Lexar support website or contact their customer service department. Keep your proof of purchase for warranty validation.
Online Support: www.lexar.com/support
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